aboutsummaryrefslogtreecommitdiffstats
path: root/print-tcp.c
diff options
context:
space:
mode:
authorGleb Smirnoff <glebius@FreeBSD.org>2017-01-31 19:17:06 +0000
committerGleb Smirnoff <glebius@FreeBSD.org>2017-01-31 19:17:06 +0000
commitd79b843cb78484ea27f877f1541055e1a6a5a4d3 (patch)
tree57b11b7f3aa68244815f4469b548fcab0c5c3e78 /print-tcp.c
parent1bf4ba1024df1c302debe8156a60a9dfafb149ee (diff)
downloadsrc-d79b843cb78484ea27f877f1541055e1a6a5a4d3.tar.gz
src-d79b843cb78484ea27f877f1541055e1a6a5a4d3.zip
Import tcpdump-4.9.0 into dist.
Notes
Notes: svn path=/vendor/tcpdump/dist/; revision=313024
Diffstat (limited to 'print-tcp.c')
-rw-r--r--print-tcp.c279
1 files changed, 151 insertions, 128 deletions
diff --git a/print-tcp.c b/print-tcp.c
index bc200e2f8e21..e0d0531b36b2 100644
--- a/print-tcp.c
+++ b/print-tcp.c
@@ -23,40 +23,37 @@
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
+/* \summary: TCP printer */
+
#ifndef lint
#else
__RCSID("$NetBSD: print-tcp.c,v 1.8 2007/07/24 11:53:48 drochner Exp $");
#endif
-#define NETDISSECT_REWORKED
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#include <tcpdump-stdinc.h>
+#include <netdissect-stdinc.h>
#include <stdlib.h>
#include <string.h>
-#include "interface.h"
+#include "netdissect.h"
#include "addrtoname.h"
#include "extract.h"
#include "tcp.h"
#include "ip.h"
-#ifdef INET6
#include "ip6.h"
-#endif
#include "ipproto.h"
#include "rpc_auth.h"
#include "rpc_msg.h"
-#include "nameser.h"
-
#ifdef HAVE_LIBCRYPTO
#include <openssl/md5.h>
-#include <signature.h>
+#include "signature.h"
static int tcp_verify_signature(netdissect_options *ndo,
const struct ip *ip, const struct tcphdr *tp,
@@ -64,6 +61,8 @@ static int tcp_verify_signature(netdissect_options *ndo,
#endif
static void print_tcp_rst_data(netdissect_options *, register const u_char *sp, u_int length);
+static void print_tcp_fastopen_option(netdissect_options *ndo, register const u_char *cp,
+ u_int datalen, int exp);
#define MAX_RST_DATA_LEN 30
@@ -81,7 +80,6 @@ struct tcp_seq_hash {
tcp_seq ack;
};
-#ifdef INET6
struct tha6 {
struct in6_addr src;
struct in6_addr dst;
@@ -94,7 +92,6 @@ struct tcp_seq_hash6 {
tcp_seq seq;
tcp_seq ack;
};
-#endif
#define TSEQ_HASHSIZE 919
@@ -102,9 +99,7 @@ struct tcp_seq_hash6 {
#define ZEROLENOPT(o) ((o) == TCPOPT_EOL || (o) == TCPOPT_NOP)
static struct tcp_seq_hash tcp_seq_hash4[TSEQ_HASHSIZE];
-#ifdef INET6
static struct tcp_seq_hash6 tcp_seq_hash6[TSEQ_HASHSIZE];
-#endif
static const struct tok tcp_flag_values[] = {
{ TH_FIN, "F" },
@@ -132,9 +127,11 @@ static const struct tok tcp_option_values[] = {
{ TCPOPT_CCNEW, "ccnew" },
{ TCPOPT_CCECHO, "" },
{ TCPOPT_SIGNATURE, "md5" },
- { TCPOPT_AUTH, "enhanced auth" },
+ { TCPOPT_SCPS, "scps" },
{ TCPOPT_UTO, "uto" },
+ { TCPOPT_TCPAO, "tcp-ao" },
{ TCPOPT_MPTCP, "mptcp" },
+ { TCPOPT_FASTOPEN, "tfo" },
{ TCPOPT_EXPERIMENT2, "exp" },
{ 0, NULL }
};
@@ -149,6 +146,16 @@ tcp_cksum(netdissect_options *ndo,
IPPROTO_TCP);
}
+static int
+tcp6_cksum(netdissect_options *ndo,
+ register const struct ip6_hdr *ip6,
+ register const struct tcphdr *tp,
+ register u_int len)
+{
+ return nextproto6_cksum(ndo, ip6, (const uint8_t *)tp, len, len,
+ IPPROTO_TCP);
+}
+
void
tcp_print(netdissect_options *ndo,
register const u_char *bp, register u_int length,
@@ -164,18 +171,14 @@ tcp_print(netdissect_options *ndo,
u_int utoval;
uint16_t magic;
register int rev;
-#ifdef INET6
register const struct ip6_hdr *ip6;
-#endif
- tp = (struct tcphdr *)bp;
- ip = (struct ip *)bp2;
-#ifdef INET6
+ tp = (const struct tcphdr *)bp;
+ ip = (const struct ip *)bp2;
if (IP_V(ip) == 6)
- ip6 = (struct ip6_hdr *)bp2;
+ ip6 = (const struct ip6_hdr *)bp2;
else
ip6 = NULL;
-#endif /*INET6*/
ch = '\0';
if (!ND_TTEST(tp->th_dport)) {
ND_PRINT((ndo, "%s > %s: [|tcp]",
@@ -187,43 +190,40 @@ tcp_print(netdissect_options *ndo,
sport = EXTRACT_16BITS(&tp->th_sport);
dport = EXTRACT_16BITS(&tp->th_dport);
- hlen = TH_OFF(tp) * 4;
-
-#ifdef INET6
if (ip6) {
if (ip6->ip6_nxt == IPPROTO_TCP) {
ND_PRINT((ndo, "%s.%s > %s.%s: ",
ip6addr_string(ndo, &ip6->ip6_src),
- tcpport_string(sport),
+ tcpport_string(ndo, sport),
ip6addr_string(ndo, &ip6->ip6_dst),
- tcpport_string(dport)));
+ tcpport_string(ndo, dport)));
} else {
ND_PRINT((ndo, "%s > %s: ",
- tcpport_string(sport), tcpport_string(dport)));
+ tcpport_string(ndo, sport), tcpport_string(ndo, dport)));
}
- } else
-#endif /*INET6*/
- {
+ } else {
if (ip->ip_p == IPPROTO_TCP) {
ND_PRINT((ndo, "%s.%s > %s.%s: ",
ipaddr_string(ndo, &ip->ip_src),
- tcpport_string(sport),
+ tcpport_string(ndo, sport),
ipaddr_string(ndo, &ip->ip_dst),
- tcpport_string(dport)));
+ tcpport_string(ndo, dport)));
} else {
ND_PRINT((ndo, "%s > %s: ",
- tcpport_string(sport), tcpport_string(dport)));
+ tcpport_string(ndo, sport), tcpport_string(ndo, dport)));
}
}
+ ND_TCHECK(*tp);
+
+ hlen = TH_OFF(tp) * 4;
+
if (hlen < sizeof(*tp)) {
ND_PRINT((ndo, " tcp %d [bad hdr length %u - too short, < %lu]",
length - hlen, hlen, (unsigned long)sizeof(*tp)));
return;
}
- ND_TCHECK(*tp);
-
seq = EXTRACT_32BITS(&tp->th_seq);
ack = EXTRACT_32BITS(&tp->th_ack);
win = EXTRACT_16BITS(&tp->th_win);
@@ -249,7 +249,6 @@ tcp_print(netdissect_options *ndo,
* both directions).
*/
rev = 0;
-#ifdef INET6
if (ip6) {
register struct tcp_seq_hash6 *th;
struct tcp_seq_hash6 *tcp_seq_hash;
@@ -287,7 +286,8 @@ tcp_print(netdissect_options *ndo,
th->nxt = (struct tcp_seq_hash6 *)
calloc(1, sizeof(*th));
if (th->nxt == NULL)
- error("tcp_print: calloc");
+ (*ndo->ndo_error)(ndo,
+ "tcp_print: calloc");
}
th->addr = tha;
if (rev)
@@ -304,30 +304,24 @@ tcp_print(netdissect_options *ndo,
thseq = th->seq;
thack = th->ack;
} else {
-#else /*INET6*/
- {
-#endif /*INET6*/
register struct tcp_seq_hash *th;
struct tcp_seq_hash *tcp_seq_hash;
- const struct in_addr *src, *dst;
struct tha tha;
tcp_seq_hash = tcp_seq_hash4;
- src = &ip->ip_src;
- dst = &ip->ip_dst;
if (sport > dport)
rev = 1;
else if (sport == dport) {
- if (UNALIGNED_MEMCMP(src, dst, sizeof ip->ip_dst) > 0)
+ if (UNALIGNED_MEMCMP(&ip->ip_src, &ip->ip_dst, sizeof ip->ip_dst) > 0)
rev = 1;
}
if (rev) {
- UNALIGNED_MEMCPY(&tha.src, dst, sizeof ip->ip_dst);
- UNALIGNED_MEMCPY(&tha.dst, src, sizeof ip->ip_src);
+ UNALIGNED_MEMCPY(&tha.src, &ip->ip_dst, sizeof ip->ip_dst);
+ UNALIGNED_MEMCPY(&tha.dst, &ip->ip_src, sizeof ip->ip_src);
tha.port = dport << 16 | sport;
} else {
- UNALIGNED_MEMCPY(&tha.dst, dst, sizeof ip->ip_dst);
- UNALIGNED_MEMCPY(&tha.src, src, sizeof ip->ip_src);
+ UNALIGNED_MEMCPY(&tha.dst, &ip->ip_dst, sizeof ip->ip_dst);
+ UNALIGNED_MEMCPY(&tha.src, &ip->ip_src, sizeof ip->ip_src);
tha.port = sport << 16 | dport;
}
@@ -343,7 +337,8 @@ tcp_print(netdissect_options *ndo,
th->nxt = (struct tcp_seq_hash *)
calloc(1, sizeof(*th));
if (th->nxt == NULL)
- error("tcp_print: calloc");
+ (*ndo->ndo_error)(ndo,
+ "tcp_print: calloc");
}
th->addr = tha;
if (rev)
@@ -386,12 +381,9 @@ tcp_print(netdissect_options *ndo,
else
ND_PRINT((ndo, " (correct)"));
}
- }
-#ifdef INET6
- else if (IP_V(ip) == 6 && ip6->ip6_plen) {
+ } else if (IP_V(ip) == 6 && ip6->ip6_plen) {
if (ND_TTEST2(tp->th_sport, length)) {
- sum = nextproto6_cksum(ip6, (const uint8_t *)tp,
- length, length, IPPROTO_TCP);
+ sum = tcp6_cksum(ndo, ip6, tp, length);
tcp_sum = EXTRACT_16BITS(&tp->th_sum);
ND_PRINT((ndo, ", cksum 0x%04x", tcp_sum));
@@ -403,7 +395,6 @@ tcp_print(netdissect_options *ndo,
}
}
-#endif
}
length -= hlen;
@@ -474,7 +465,7 @@ tcp_print(netdissect_options *ndo,
case TCPOPT_SACK:
datalen = len - 2;
if (datalen % 8 != 0) {
- ND_PRINT((ndo, "malformed sack"));
+ ND_PRINT((ndo, " invalid sack"));
} else {
uint32_t s, e;
@@ -522,6 +513,7 @@ tcp_print(netdissect_options *ndo,
case TCPOPT_SIGNATURE:
datalen = TCP_SIGLEN;
LENCHECK(datalen);
+ ND_PRINT((ndo, " "));
#ifdef HAVE_LIBCRYPTO
switch (tcp_verify_signature(ndo, ip, tp,
bp + TH_OFF(tp) * 4, length, cp)) {
@@ -546,15 +538,35 @@ tcp_print(netdissect_options *ndo,
#endif
break;
- case TCPOPT_AUTH:
- ND_PRINT((ndo, "keyid %d", *cp++));
- datalen = len - 3;
- for (i = 0; i < datalen; ++i) {
- LENCHECK(i);
- ND_PRINT((ndo, "%02x", cp[i]));
- }
+ case TCPOPT_SCPS:
+ datalen = 2;
+ LENCHECK(datalen);
+ ND_PRINT((ndo, " cap %02x id %u", cp[0], cp[1]));
break;
+ case TCPOPT_TCPAO:
+ datalen = len - 2;
+ /* RFC 5925 Section 2.2:
+ * "The Length value MUST be greater than or equal to 4."
+ * (This includes the Kind and Length fields already processed
+ * at this point.)
+ */
+ if (datalen < 2) {
+ ND_PRINT((ndo, " invalid"));
+ } else {
+ LENCHECK(1);
+ ND_PRINT((ndo, " keyid %u", cp[0]));
+ LENCHECK(2);
+ ND_PRINT((ndo, " rnextkeyid %u", cp[1]));
+ if (datalen > 2) {
+ ND_PRINT((ndo, " mac 0x"));
+ for (i = 2; i < datalen; i++) {
+ LENCHECK(i + 1);
+ ND_PRINT((ndo, "%02x", cp[i]));
+ }
+ }
+ }
+ break;
case TCPOPT_EOL:
case TCPOPT_NOP:
@@ -569,7 +581,7 @@ tcp_print(netdissect_options *ndo,
datalen = 2;
LENCHECK(datalen);
utoval = EXTRACT_16BITS(cp);
- ND_PRINT((ndo, "0x%x", utoval));
+ ND_PRINT((ndo, " 0x%x", utoval));
if (utoval & 0x0001)
utoval = (utoval >> 1) * 60;
else
@@ -584,6 +596,13 @@ tcp_print(netdissect_options *ndo,
goto bad;
break;
+ case TCPOPT_FASTOPEN:
+ datalen = len - 2;
+ LENCHECK(datalen);
+ ND_PRINT((ndo, " "));
+ print_tcp_fastopen_option(ndo, cp, datalen, FALSE);
+ break;
+
case TCPOPT_EXPERIMENT2:
datalen = len - 2;
LENCHECK(datalen);
@@ -595,21 +614,8 @@ tcp_print(netdissect_options *ndo,
switch(magic) {
- case 0xf989:
- /* TCP Fast Open: RFC 7413 */
- if (datalen == 2) {
- /* Fast Open Cookie Request */
- ND_PRINT((ndo, "tfo cookiereq"));
- } else {
- /* Fast Open Cookie */
- if (datalen % 2 != 0 || datalen < 6 || datalen > 18) {
- ND_PRINT((ndo, "tfo malformed"));
- } else {
- ND_PRINT((ndo, "tfo cookie "));
- for (i = 2; i < datalen; ++i)
- ND_PRINT((ndo, "%02x", cp[i]));
- }
- }
+ case 0xf989: /* TCP Fast Open RFC 7413 */
+ print_tcp_fastopen_option(ndo, cp + 2, datalen - 2, TRUE);
break;
default:
@@ -624,7 +630,7 @@ tcp_print(netdissect_options *ndo,
if (datalen)
ND_PRINT((ndo, " 0x"));
for (i = 0; i < datalen; ++i) {
- LENCHECK(i);
+ LENCHECK(i + 1);
ND_PRINT((ndo, "%02x", cp[i]));
}
break;
@@ -669,58 +675,59 @@ tcp_print(netdissect_options *ndo,
case PT_ZMTP1:
zmtp1_print(ndo, bp, length);
break;
+ case PT_RESP:
+ resp_print(ndo, bp, length);
+ break;
}
return;
}
- if (sport == TELNET_PORT || dport == TELNET_PORT) {
+ if (IS_SRC_OR_DST_PORT(TELNET_PORT)) {
telnet_print(ndo, bp, length);
- } else if (sport == SMTP_PORT || dport == SMTP_PORT) {
+ } else if (IS_SRC_OR_DST_PORT(SMTP_PORT)) {
ND_PRINT((ndo, ": "));
smtp_print(ndo, bp, length);
- } else if (sport == BGP_PORT || dport == BGP_PORT)
+ } else if (IS_SRC_OR_DST_PORT(BGP_PORT))
bgp_print(ndo, bp, length);
- else if (sport == PPTP_PORT || dport == PPTP_PORT)
+ else if (IS_SRC_OR_DST_PORT(PPTP_PORT))
pptp_print(ndo, bp);
-#ifdef TCPDUMP_DO_SMB
- else if (sport == NETBIOS_SSN_PORT || dport == NETBIOS_SSN_PORT)
+ else if (IS_SRC_OR_DST_PORT(REDIS_PORT))
+ resp_print(ndo, bp, length);
+#ifdef ENABLE_SMB
+ else if (IS_SRC_OR_DST_PORT(NETBIOS_SSN_PORT))
nbt_tcp_print(ndo, bp, length);
- else if (sport == SMB_PORT || dport == SMB_PORT)
+ else if (IS_SRC_OR_DST_PORT(SMB_PORT))
smb_tcp_print(ndo, bp, length);
#endif
- else if (sport == BEEP_PORT || dport == BEEP_PORT)
+ else if (IS_SRC_OR_DST_PORT(BEEP_PORT))
beep_print(ndo, bp, length);
- else if (sport == OPENFLOW_PORT_OLD || dport == OPENFLOW_PORT_OLD ||
- sport == OPENFLOW_PORT_IANA || dport == OPENFLOW_PORT_IANA)
+ else if (IS_SRC_OR_DST_PORT(OPENFLOW_PORT_OLD) || IS_SRC_OR_DST_PORT(OPENFLOW_PORT_IANA))
openflow_print(ndo, bp, length);
- else if (sport == FTP_PORT || dport == FTP_PORT) {
+ else if (IS_SRC_OR_DST_PORT(FTP_PORT)) {
ND_PRINT((ndo, ": "));
ftp_print(ndo, bp, length);
- } else if (sport == HTTP_PORT || dport == HTTP_PORT ||
- sport == HTTP_PORT_ALT || dport == HTTP_PORT_ALT) {
+ } else if (IS_SRC_OR_DST_PORT(HTTP_PORT) || IS_SRC_OR_DST_PORT(HTTP_PORT_ALT)) {
ND_PRINT((ndo, ": "));
http_print(ndo, bp, length);
- } else if (sport == RTSP_PORT || dport == RTSP_PORT ||
- sport == RTSP_PORT_ALT || dport == RTSP_PORT_ALT) {
+ } else if (IS_SRC_OR_DST_PORT(RTSP_PORT) || IS_SRC_OR_DST_PORT(RTSP_PORT_ALT)) {
ND_PRINT((ndo, ": "));
rtsp_print(ndo, bp, length);
} else if (length > 2 &&
- (sport == NAMESERVER_PORT || dport == NAMESERVER_PORT ||
- sport == MULTICASTDNS_PORT || dport == MULTICASTDNS_PORT)) {
+ (IS_SRC_OR_DST_PORT(NAMESERVER_PORT))) {
/*
* TCP DNS query has 2byte length at the head.
* XXX packet could be unaligned, it can go strange
*/
ns_print(ndo, bp + 2, length - 2, 0);
- } else if (sport == MSDP_PORT || dport == MSDP_PORT) {
+ } else if (IS_SRC_OR_DST_PORT(MSDP_PORT)) {
msdp_print(ndo, bp, length);
- } else if (sport == RPKI_RTR_PORT || dport == RPKI_RTR_PORT) {
+ } else if (IS_SRC_OR_DST_PORT(RPKI_RTR_PORT)) {
rpki_rtr_print(ndo, bp, length);
}
- else if (length > 0 && (sport == LDP_PORT || dport == LDP_PORT)) {
+ else if (length > 0 && (IS_SRC_OR_DST_PORT(LDP_PORT))) {
ldp_print(ndo, bp, length);
}
- else if ((sport == NFS_PORT || dport == NFS_PORT) &&
+ else if ((IS_SRC_OR_DST_PORT(NFS_PORT)) &&
length >= 4 && ND_TTEST2(*bp, 4)) {
/*
* If data present, header length valid, and NFS port used,
@@ -729,23 +736,23 @@ tcp_print(netdissect_options *ndo,
* to NFS print routines.
*/
uint32_t fraglen;
- register struct sunrpc_msg *rp;
+ register const struct sunrpc_msg *rp;
enum sunrpc_msg_type direction;
fraglen = EXTRACT_32BITS(bp) & 0x7FFFFFFF;
if (fraglen > (length) - 4)
fraglen = (length) - 4;
- rp = (struct sunrpc_msg *)(bp + 4);
+ rp = (const struct sunrpc_msg *)(bp + 4);
if (ND_TTEST(rp->rm_direction)) {
direction = (enum sunrpc_msg_type)EXTRACT_32BITS(&rp->rm_direction);
if (dport == NFS_PORT && direction == SUNRPC_CALL) {
ND_PRINT((ndo, ": NFS request xid %u ", EXTRACT_32BITS(&rp->rm_xid)));
- nfsreq_print_noaddr(ndo, (u_char *)rp, fraglen, (u_char *)ip);
+ nfsreq_print_noaddr(ndo, (const u_char *)rp, fraglen, (const u_char *)ip);
return;
}
if (sport == NFS_PORT && direction == SUNRPC_REPLY) {
ND_PRINT((ndo, ": NFS reply xid %u ", EXTRACT_32BITS(&rp->rm_xid)));
- nfsreply_print_noaddr(ndo, (u_char *)rp, fraglen, (u_char *)ip);
+ nfsreply_print_noaddr(ndo, (const u_char *)rp, fraglen, (const u_char *)ip);
return;
}
}
@@ -790,13 +797,37 @@ print_tcp_rst_data(netdissect_options *ndo,
ND_PRINT((ndo, "+")); /* indicate we truncate */
}
ND_PRINT((ndo, " "));
- while (length-- && sp <= ndo->ndo_snapend) {
+ while (length-- && sp < ndo->ndo_snapend) {
c = *sp++;
safeputchar(ndo, c);
}
ND_PRINT((ndo, "]"));
}
+static void
+print_tcp_fastopen_option(netdissect_options *ndo, register const u_char *cp,
+ u_int datalen, int exp)
+{
+ u_int i;
+
+ if (exp)
+ ND_PRINT((ndo, "tfo"));
+
+ if (datalen == 0) {
+ /* Fast Open Cookie Request */
+ ND_PRINT((ndo, " cookiereq"));
+ } else {
+ /* Fast Open Cookie */
+ if (datalen % 2 != 0 || datalen < 4 || datalen > 16) {
+ ND_PRINT((ndo, " invalid"));
+ } else {
+ ND_PRINT((ndo, " cookie "));
+ for (i = 0; i < datalen; ++i)
+ ND_PRINT((ndo, "%02x", cp[i]));
+ }
+ }
+}
+
#ifdef HAVE_LIBCRYPTO
USES_APPLE_DEPRECATED_API
static int
@@ -809,11 +840,9 @@ tcp_verify_signature(netdissect_options *ndo,
char zero_proto = 0;
MD5_CTX ctx;
uint16_t savecsum, tlen;
-#ifdef INET6
- struct ip6_hdr *ip6;
+ const struct ip6_hdr *ip6;
uint32_t len32;
uint8_t nxt;
-#endif
if (data + length > ndo->ndo_snapend) {
ND_PRINT((ndo, "snaplen too short, "));
@@ -832,33 +861,27 @@ tcp_verify_signature(netdissect_options *ndo,
* Step 1: Update MD5 hash with IP pseudo-header.
*/
if (IP_V(ip) == 4) {
- MD5_Update(&ctx, (char *)&ip->ip_src, sizeof(ip->ip_src));
- MD5_Update(&ctx, (char *)&ip->ip_dst, sizeof(ip->ip_dst));
- MD5_Update(&ctx, (char *)&zero_proto, sizeof(zero_proto));
- MD5_Update(&ctx, (char *)&ip->ip_p, sizeof(ip->ip_p));
+ MD5_Update(&ctx, (const char *)&ip->ip_src, sizeof(ip->ip_src));
+ MD5_Update(&ctx, (const char *)&ip->ip_dst, sizeof(ip->ip_dst));
+ MD5_Update(&ctx, (const char *)&zero_proto, sizeof(zero_proto));
+ MD5_Update(&ctx, (const char *)&ip->ip_p, sizeof(ip->ip_p));
tlen = EXTRACT_16BITS(&ip->ip_len) - IP_HL(ip) * 4;
tlen = htons(tlen);
- MD5_Update(&ctx, (char *)&tlen, sizeof(tlen));
-#ifdef INET6
+ MD5_Update(&ctx, (const char *)&tlen, sizeof(tlen));
} else if (IP_V(ip) == 6) {
- ip6 = (struct ip6_hdr *)ip;
- MD5_Update(&ctx, (char *)&ip6->ip6_src, sizeof(ip6->ip6_src));
- MD5_Update(&ctx, (char *)&ip6->ip6_dst, sizeof(ip6->ip6_dst));
+ ip6 = (const struct ip6_hdr *)ip;
+ MD5_Update(&ctx, (const char *)&ip6->ip6_src, sizeof(ip6->ip6_src));
+ MD5_Update(&ctx, (const char *)&ip6->ip6_dst, sizeof(ip6->ip6_dst));
len32 = htonl(EXTRACT_16BITS(&ip6->ip6_plen));
- MD5_Update(&ctx, (char *)&len32, sizeof(len32));
+ MD5_Update(&ctx, (const char *)&len32, sizeof(len32));
nxt = 0;
- MD5_Update(&ctx, (char *)&nxt, sizeof(nxt));
- MD5_Update(&ctx, (char *)&nxt, sizeof(nxt));
- MD5_Update(&ctx, (char *)&nxt, sizeof(nxt));
+ MD5_Update(&ctx, (const char *)&nxt, sizeof(nxt));
+ MD5_Update(&ctx, (const char *)&nxt, sizeof(nxt));
+ MD5_Update(&ctx, (const char *)&nxt, sizeof(nxt));
nxt = IPPROTO_TCP;
- MD5_Update(&ctx, (char *)&nxt, sizeof(nxt));
-#endif
+ MD5_Update(&ctx, (const char *)&nxt, sizeof(nxt));
} else {
-#ifdef INET6
ND_PRINT((ndo, "IP version not 4 or 6, "));
-#else
- ND_PRINT((ndo, "IP version not 4, "));
-#endif
return (CANT_CHECK_SIGNATURE);
}
@@ -868,7 +891,7 @@ tcp_verify_signature(netdissect_options *ndo,
*/
savecsum = tp1.th_sum;
tp1.th_sum = 0;
- MD5_Update(&ctx, (char *)&tp1, sizeof(struct tcphdr));
+ MD5_Update(&ctx, (const char *)&tp1, sizeof(struct tcphdr));
tp1.th_sum = savecsum;
/*
* Step 3: Update MD5 hash with TCP segment data, if present.